A novel closed-loop DC voltage regulation strategy in DC micro-grid

In this paper, a novel closed-loop DC voltage regulation strategy of DC micro-grid is proposed, which includes tertiary control, secondary control and primary control. The tertiary control is in charge of economical dispatch. It assigns the scheduled power to all the voltage controllers. The primary control and secondary control are real time operation control. The secondary control provides the voltage set point for the primary control through distributed cooperative mechanism to maintain the micro-grid average voltage as the reference value and help fine proportional load sharing which is assigned by the tertiary control. The primary control, implementing a droop mechanism, regulates the output voltage of individual converters. The simulation results validate the effectiveness of the proposed strategy.